sshd_config(5)
Specifically, the option PermitRootLogin.
I would leave sshd running tbh. Even if you feel you don't need it, it will almost certainly save you in an emergency. As long as you have sane passwords (or perhaps, use keys and disable passwords), it's fine.

One way would be to try to connect to your localhost via ssh, if it is not enabled you won't be able to.

Code:

$ ssh localhost
garry@localhost's password:
Last login: Mon Oct 9 06:41:34 2017
OpenBSD 6.1 (GENERIC.MP) #5: Mon Jun 12 20:52:45 CEST 2017
Welcome to OpenBSD: The proactively secure Unix-like operating system.
Please use the sendbug(1) utility to report bugs in the system.
Before reporting a bug, please try to reproduce it with the latest
version of the code. With bug reports, please try to ensure that
enough information to reproduce the problem is enclosed, and if a
known fix for it exists, include that as well.
$

Nightweaver >>
SSH server is already there. You just have to enable it in /etc/rc.conf to be started at boot. Configuration is done in /etc/ssh/sshd_config. For more details check: http://www.openssh.org/faq.html
__________________
If it moves, crypt it. Unless it's static - than you should double-crypt it.